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It is closely related with the delta modulation (see above).
In delta modulation, the transmitted data is reduced to a 1-bit data stream.
Delta modulation, in particular pure DM has very few practical uses.
On the contrary, the delta modulation is a random process that produces continuous spectrum without distinct harmonics.
Delta modulation is a form of DPCM which uses one bit per sample.
In delta modulation there is no restriction on the amplitude of the signal waveform, because the number of levels is not fixed.
It uses the 16 kbit/s continuously variable slope delta modulation (CVSD).
Audio sampling was in stereo at 32 kHz/12 bit and encoded using a form of linear delta modulation called LDM-2.
Delta modulation (DM or Δ-modulation)
The 5.1 tracks were encoded using 16-bit PCM audio in a delta modulation compression which resulted in a compression level of 4:1.
Principles of realizing multichannel analog-digital converters with synchronous mini-code delta modulation and with compression of multidimensional continuous signals.
Continuously variable slope delta modulation (CVSD), 16 kbit/s, used in wide band encryptors such as the KY-57.
Continuously variable slope delta modulation (CVSD or CVSDM) is a voice coding method.
To achieve high signal-to-noise ratio, delta modulation must use oversampling techniques, that is, the analog signal is sampled at a rate several times higher than the Nyquist rate.
It is a delta modulation with variable step size (i.e. special case of adaptive delta modulation), first proposed by Greefkes and Riemens in 1970.
The complete function of Delta Modulation, VAC and Echo Control for six ports was implemented in a single digital integrated circuit chip with twelve bit arithmetic.
Continuously variable slope delta modulation (CVSDM), also called Adaptive-delta modulation (ADM)
The two sources of noise in delta modulation are "slope overload", when steps are too small to track the original waveform, and "granularity", when steps are too large.
Derived forms of delta modulation are continuously variable slope delta modulation, delta-sigma modulation, and differential modulation.
Secure audio transmitted by SINCGARS radios is digitized and compressed with 16 Kbit/s Continuously variable slope delta modulation.
Rather than quantizing the absolute value of the input analog waveform, delta modulation quantizes the difference between the current and the previous step, as shown in the block diagram in Fig. 1.
In the use of delta modulation for PWM control, the output signal is integrated, and the result is compared with limits, which correspond to a Reference signal offset by a constant.
Unlike other similar pieces of equipment like the Sony PCM-F1, the Model 700 used a technique called Companded Predictive Delta Modulation, rather than the now-common pulse-code modulation.
The Model 700 converted analog audio into digital data using a type of delta-sigma modulation, called "Companded Predictive Delta Modulation," or "CPDM" (both trademarked).
The voice ports used digitally implemented 24kbit/s Delta Modulation with Voice Activity Compression or VAC and Echo Suppressors to control the half second echo path through the satellite.